Kathy,
Tire rotation on a Beaver is rarely done because the cost is not justified except on rare occasions. One the vast majority of Beaver coaches, the tires never wear out, they age out, and are replaced because of age and not wear.
There is also the problem with rotating tires where all of your wheels are not the same. A large number of coaches have a steel wheel for the inner wheel on the drive axle, and on a lot of coaches the aluminum wheels are polished on just one side, so a tire rotation would require dismounting, remounting, and rebalancing.
Since you did not say what coach you have, I do not know if this will effect you, but on some coaches with a tag axle, the tag axle and front tires are swapped if a wear condition on the fronts develops like the infamous Goodyear channeling and cupping. This will allow you to run the tires long enough for them to age out without having to put up with the noise.
Gerald